Python - NLTK - 言語処理とPython(Text、indexメソッド)

入門 自然言語処理
原著

開発環境

• macOS High Sierra - Apple
• Emacs (Text Editor)
• Python 3.6 (プログラミング言語)

入門 自然言語処理 (Steven Bird (著)、Ewan Klein (著)、Edward Loper (著)、萩原 正人 (翻訳)、中山 敬広 (翻訳)、水野 貴明 (翻訳)、オライリージャパン)の1章(言語処理とPython)、1.8(演習問題)17.を取り組んでみる。

コード(Emacs)

Python 3

#!/usr/bin/env python3

print('17.')
from nltk.book import *

word = 'sunset'
i = text9.index(word)
print(i)

print(text9[i:i + 10])

print(text9[i:i + 15])
print(text9[i - 10:i + 15])
print(text9[i - 20:i + 15])
print(text9[i - 15:i + 15])
print(text9[i - 8:i + 15])

print(' '.join(text9[i - 8:i + 15]))

入出力結果(Terminal, Jupyter(IPython))

$ ./sample12.py
17.
*** Introductory Examples for the NLTK Book ***
Loading text1, ..., text9 and sent1, ..., sent9
Type the name of the text or sentence to view it.
Type: 'texts()' or 'sents()' to list the materials.
text1: Moby Dick by Herman Melville 1851
text2: Sense and Sensibility by Jane Austen 1811
text3: The Book of Genesis
text4: Inaugural Address Corpus
text5: Chat Corpus
text6: Monty Python and the Holy Grail
text7: Wall Street Journal
text8: Personals Corpus
text9: The Man Who Was Thursday by G . K . Chesterton 1908
629
['sunset', 'side', 'of', 'London', ',', 'as', 'red', 'and', 'ragged', 'as']
['sunset', 'side', 'of', 'London', ',', 'as', 'red', 'and', 'ragged', 'as', 'a', 'cloud', 'of', 'sunset', '.']
['SAFFRON', 'PARK', 'THE', 'suburb', 'of', 'Saffron', 'Park', 'lay', 'on', 'the', 'sunset', 'side', 'of', 'London', ',', 'as', 'red', 'and', 'ragged', 'as', 'a', 'cloud', 'of', 'sunset', '.']
['K', '.', 'C', '.', 'CHAPTER', 'I', 'THE', 'TWO', 'POETS', 'OF', 'SAFFRON', 'PARK', 'THE', 'suburb', 'of', 'Saffron', 'Park', 'lay', 'on', 'the', 'sunset', 'side', 'of', 'London', ',', 'as', 'red', 'and', 'ragged', 'as', 'a', 'cloud', 'of', 'sunset', '.']
['I', 'THE', 'TWO', 'POETS', 'OF', 'SAFFRON', 'PARK', 'THE', 'suburb', 'of', 'Saffron', 'Park', 'lay', 'on', 'the', 'sunset', 'side', 'of', 'London', ',', 'as', 'red', 'and', 'ragged', 'as', 'a', 'cloud', 'of', 'sunset', '.']
['THE', 'suburb', 'of', 'Saffron', 'Park', 'lay', 'on', 'the', 'sunset', 'side', 'of', 'London', ',', 'as', 'red', 'and', 'ragged', 'as', 'a', 'cloud', 'of', 'sunset', '.']
THE suburb of Saffron Park lay on the sunset side of London , as red and ragged as a cloud of sunset .
$